hey there @jmjobin 
thanks for trying workbench 
can you run the Particle: Audit Environment command and share the non-sensitive portions of the report it generates here?
sounds like things were working at one point - do you recall any changes you may have made to your local environment that could account for the change (ex: updated VSCode, updated Workbench extensions, other)?
can you also please provide the steps required to reproduce the issue as described over here: Information: How to report bugs and provide feedback
for future reference, we have a category dedicated to the Particle Workbench over here: https://community.particle.io/c/particle-workbench